clknode_set_parent_by_idx
clknode_set_parent_by_idx(clk, best_parent);
clknode_set_parent_by_idx(clk, best_parent);
int clknode_set_parent_by_idx(struct clknode *clk, int idx);
clknode_set_parent_by_idx(clk, sc->main_parent);
clknode_set_parent_by_idx(clk, best_parent);
clknode_set_parent_by_idx(clk, best_parent);
rv = clknode_set_parent_by_idx(clk, 1);
clknode_set_parent_by_idx(sc->clknode,
clknode_set_parent_by_idx(sc->clknode, i);
clknode_set_parent_by_idx(sc->clknode,
clknode_set_parent_by_idx(sc->clknode, i);